Wellington Nap B-21 Reservoir Report
Last Updated: December 9, 2025
Wellington Nap B-21, also known as Wellington Nap Watershed Site B-21 Dam, is a vital piece of infrastructure located in Lafayette, Missouri, designed by the USDA NRCS and completed in 1970.
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Summary
This earth dam stands at a height of 47 feet and spans a length of 375 feet, serving primarily for flood risk reduction in the area. With a normal storage capacity of 46 acre-feet and a maximum discharge of 1500 cubic feet per second, Wellington Nap B-21 plays a crucial role in managing water levels and mitigating potential flooding risks in the region.
Managed by the local government and regulated by the Dam and Reservoir Safety Program, Wellington Nap B-21 is inspected every five years to ensure its structural integrity and safety standards. Despite being classified as having a low hazard potential and a satisfactory condition assessment, the dam is subject to moderate risk (3) based on a risk assessment. While it currently does not have an Emergency Action Plan (EAP) in place, the dam is equipped with an uncontrolled spillway and no outlet gates, catering to its flood risk reduction purpose and ensuring the safety of the surrounding communities in case of emergency.
Situated along the TR to Big Sni-A-Bar Creek, Wellington Nap B-21 serves as a crucial component of the water resource infrastructure in the area, with a drainage area of 270 acres and a surface area of 5 acres. With its strategic location and design, this dam stands as a testament to effective water management practices and highlights the importance of proactive risk assessment and management in safeguarding communities against potential water-related disasters.
Year Completed |
1970 |
Dam Length |
375 |
Dam Height |
47 |
River Or Stream |
TR TO BIG SNI-A-BAR CREEK |
Primary Dam Type |
Earth |
Surface Area |
5 |
Drainage Area |
270 |
Nid Storage |
66 |
Structural Height |
47 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
47 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
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